T410s won't boot on battery power

This is a relatively new problem (i.e. it didn't happen when I first got the laptop). If the computer is fully off, and I unplug it, I press the power button and nothing happens. When I plug it in, I can turn it on no problem. Sleep mode on/off is unaffected by this.
I sent it in for an RMA a while back and they said the battery didn't pass tests. They sent me a new one but I'm still having problems. Any ideas? Is it a setting somewhere I'm missing?

hey kayson,
i would recommend that you get in contact with tech support via the link below
http://www.lenovo.com/contact/us/en/
WW Social Media
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